If the income elasticity of a good is positive we can only conclude that the good is a normal good.
The term "income elasticity of demand" describes how responsive a given good's quantity demand is to changes in the real income of the consumers who purchase it. The quantity of demand for a good or service is responsive to changes in income according to an economic metric called income elasticity of demand. The percent change in quantity demanded divided by the percent change in income is the formula for calculating the income elasticity of demand. Demand for a good or service will increase with an increase in consumer income and decrease with an increase in consumer income is known as positive income elasticity of demand. Normal goods are commodities with positive income elasticity of demand.
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